H4006 Datasheet, PDF (8/10 Pages) EM Microelectronic - MARIN SA – 13.56MHz 64 Data bit Read Only Contactless Identification Device

EM MICROELECTRONIC-MARIN SA H4006
Power Supply Management
For a correct operation, the device must be
initialised. When the transponder is put in the RF
field, the supply voltage increases until it achieves Vr
limit (see Figure 7). During this time and for an
additionnal 64 bit period, the modulator switch is on
and the device initialises its internal logic.
At this point, the data transmission starts and runs
while the supply voltage is higher than Vmin. If the
supply voltage decreases under this limit, the device
is again in an initialising state and the modulator is on.
supply voltage
VDD
chip operating voltage range : from Vmin to Vmax
Vmax (voltage clipping)
chip on board supply voltage
Vr (Read wake up)
Vmin
ε
modulator
ON/OFF _ON
OFF
64 bits
period
READ
time
time
Figure 7
8